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Compliant Hexagonal Meso-Structures Having Both High Shear Strength and High Shear Strain

[+] Author Affiliations
Jaehyung Ju, Joshua D. Summers, John Ziegert, George Fadel

Clemson University, Clemson, SC

Paper No. DETC2010-28672, pp. 533-541; 9 pages
doi:10.1115/DETC2010-28672
From:
  • ASME 2010 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 2: 34th Annual Mechanisms and Robotics Conference, Parts A and B
  • Montreal, Quebec, Canada, August 15–18, 2010
  • Conference Sponsors: Design Engineering Division and Computers in Engineering Division
  • ISBN: 978-0-7918-4410-6 | eISBN: 978-0-7918-3881-5
  • Copyright © 2010 by ASME

abstract

Motivated by the authors’ previous study on flexible honeycomb design with negative Poisson’s ratio (NPR) often called ‘auxetic’ [1], more geometric options of hexagonal honeycomb meso-structures are explored with various ratios of the vertical cell length, h to the inclined length, l. While designing an effective shear modulus, e.g., G12 * of 10MPa, of hexagonal honeycombs, we are searching honeycomb geometries. Using an aluminum alloy (7075-T6) as the constituent material, the in-plane linear elastic honeycomb model is employed to get effective shear moduli, effective shear yield strengths and effective shear yield strains of hexagonal honeycombs. The numerical parametric study based on the linear cellular theory is combined with honeycomb design to get the optimal cell geometry associated with a manufacturing limitation. The re-entrant geometry makes 7075-T6 NPR honeycombs flexible, resulting in an effective shear yield strength, (τpl *)12 of 1.7MPa and an effective shear yield strain, (γpl *)12 of 0.17 when they are designed to have a G12 * of 10MPa.

Copyright © 2010 by ASME

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